<div>app</div>
<app-layout></app-layout>
<app-template>
    <!-- <div class="a">a</div>
    <div class="b">b</div> -->
    <!-- 模板 -->
    <!-- <ng-container class="a">aaa</ng-container> -->
    <!-- <ng-container class="b">bbb</ng-container> -->
    <!-- 模板 -->
</app-template>